MM908E625, Silicon Revision A Errata

Freescale Semiconductor
Errata (or Chip Errata)
MM908E625ER
Rev 1.0, 12/2005
Document order number:
MM908E625, Silicon Revision A Errata
INTRODUCTION
This errata sheet applies to the following device:
•
MM908E625ACDWB
Device Revision Identification
The device revision is indicated by a 1-character code after the device code. For instance the “A” in the “MM908E625ACDWB”
indicates revision A. All standard devices are marked with a device identification and build information code.
Device Build Information / Date Code
Device markings indicate build information containing the week and year of manufacture. The date is coded with the last four
characters of the nine character build information code (e.g. “CTKAH0429”). The date is coded as four numerical digits where
the first two digits indicate the year and the last two digits indicate the week. For instance, the date code “0429” indicates the 29th
week of the year 2004.
Device Part Number Prefixes
Some device samples are marked with a PM prefix. A PM prefix indicates a prototype device which has undergone basic testing
only. After full characterization and qualification, devices will be marked with the MM prefix.
908EY16 MICROPROCESSOR, 2L31N/3L31N MASK ERRATA
Description
The MM908E625ACDWB device contains both Analog and the 908EY16 mask 3L31N is equivalent to 2L31N.
Please refer to the 68HC908EY16 Product Summary Page for the latest Erratas available.
•
•
LIN Break Delimiter recognition - SE91-LIN_Break
Internal Clock Generator Stability Bit Not Set - SE92-ICG
© Freescale Semiconductor, Inc., 2005. All rights reserved.
ANALOG, L90B8 MASK ERRATA - LIN DOMINANT ISSUE
ANALOG, L90B8 MASK ERRATA - LIN DOMINANT ISSUE
The LIN Physical Layer Specification which is part of the LIN Specification Package 2.0 defines the VSUP supply voltage range
between 7V and 18V (VBAT range 8V to 18V). On this device, the LIN bus output can get stuck in dominant state if both
conditions are present:
1.
2.
The supply voltage VSUP is below 5.5V and above 4.0V (5.5V > VSUP > 4.0V).
The device is in Normal Mode and the transceiver is forcing the LIN to dominant state (TXD=0V).
If VSUP drops further below 4.0V (Low-Voltage Reset Threshold typical value), the device will reset and the LIN bus goes in
recessive state or if the VSUP is increasing above 5.5V the LIN bus goes also in recessive state (Normal Operation).
Work-Around
Avoid Stuck Condition
To avoid the transceiver to transmit data in the critical VSUP area (5.5V to 4.0V), the Low-Voltage Interrupt or the on-chip voltage
measurement can be used to detect the critical VSUP area and to disable (by software) the transmission. To re-enable the
transmission, the Low-Voltage Flag or the on-chip voltage measurement can be used to detect that the supply voltage is back
high enough.
Remove Stuck Condition
To avoid having the stuck condition present for a longer period of time, it’s possible to detect the dominant state by monitoring
the RXD signal. The stuck in dominant state can be removed by disabling the LIN physical layer (LIN P/L). The LIN P/L is disabled
by clearing the PSON bit in the system control register SYSCTL (SPI register), this is also the case if device enters STOP mode.
MM908E625ER
2
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MM908E625ER
Rev 1.0
12/2005
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